gcp_credentials = service_account.ServiceAccountCredentials
    .from_json_keyfile_name('credentials/gce_token.json', scopes=[const.GCP_SCOPE])
gcp_http = gcp_credentials.authorize(http=build_http())
crm_service = discovery.build('cloudresourcemanager', 'v1', http=gcp_http)
crm_projects_api = crm_service.projects()
projects_list = crm_projects_api.list().execute()['projects']
project_id_list = [p['projectId'] for p in projects_list]